I just had the air cleaner beadblasted. I painted the inside of the base and lid with Semi Flat black. Then I applied several coats of VHT black wrinkle on the outside of the base and lid. The set it in the sun to dry. One thing I did use was a heat gun that I kept constantly moving around as the paint dried. One of the keys with the wrinkle paint is that it needs a lot of heat to "wrinkle" correctly.
A kitchen oven at 200 degrees works well, but its hard to get that smell out after that....DAMHIK